Black Spot Inside Duck Eggs?

[stacyw0915]

Hello! This is my first time incubating and (hopefully) hatching ducklings. We are currently on day 17 of 28 and today there appears to be some dark black spots/areas inside a few of the eggs. I apologize for the picture quality but does anyone know if this looks normal? There is still movement inside the eggs. the black spots do not appear to be the embryos, just something that showed up today. Thank you for the help!

 

[Chicken poppy]

If im correct, it is a blood spot. Its caused by a rupture of a blood vessel on the yolk surface. I think its fine, just how it was layed. But i could tottally be wrong

 

[stacyw0915]

If im correct, it is a blood spot. Its caused by a rupture of a blood vessel on the yolk surface. I think its fine, just how it was layed. But i could tottally be wrong

Thank you! I hope that's all it is

 

[Chicken poppy]

Thank you! I hope that's all it is

Me to, let me know if anything changes.